Sebastian ziani de ferranti



(No Model.)

S. Z. DE PERRANTI. JQINT PoR BLBGTRIG MANs.

No. 409,188. Patented Aug. 20, 1889.

N. Pneus. Phnen-umasnphr. wnhingam nc.

UNITED STATES PATENT OEEIcE.

SEBASTIAN ZIANI DE FERRANTI, OF IIAMPSTEAD, COUNTY OF MIDDLESEX ENGLAND.

JOINT FOR ELECTRIC MAINS.

SPECIFICATION forming part f Letters Patent NO. 409,183, dated August 20, 1889.

Application filed March 30, 1889. Serial No. 305,441. (No model.)

T0 all whom t may concern:

Be it known that I, SEBASTIAN ZIANI DE FERRANTI, electrician, a subject of the Queen of Great lritain, residing at l2() Fellows Road, Hampstead, in the county of Middlesex, England, have invented certain new and useful Improvements in Joints for Electric Mai ns, ot which the iollowin g is a specification.

The object of this invention is to provide a rc exible expansion-joint for conplingtogether lengths of electrical conductors composed of t-wo concentric tubes separated from one another by insulating material.

I make the joint in the following manner:

i5 I insert into the ends of the inner conductors copper cones, which are connected by iiexible conducting-strands, and I connect the outer conductors by a metallic tube corrugated transversely. To prevent an arc being formed zo between the coupling which unites the inner conductors and the corrugated tube which unites the outer conductors, a tubular telescopic or expansible screen is interposed between them.

2 5 rlhe drawings annexed show a joint formed according to my invention.

Figure l is a longitudinal section, and Fig. 2 a transverse section, of the joint. Fig. 3 is a section through one of the lengths of the 3o concentric tubular conductors which the joint connects.

(t is the inner tubular conductor, of copper. b is the outer tubular conductor, preferably of the saine metal. c is the insulating mate- 3 5 rial between the two.

f f are hollow cones or plugs of copper screwed into the conductors a a, and g g are vflexible wire strands soldered to them.

7L is a copper tube the central portion of 4o which is corrugated transversely, as shown.

it" are rings fitting into its plain ends and titting over the outer tubular conductor Z). lhese rings inclose between them a cavity for white-metal to be poured into. Then whiten 4 5 metalis poured in, the tubes b and h and the rings i and 1l become soldered together.

The outer tube b of the portion of the concentric tnlnilar conductor which projects beyond the ring t" is cut away and a tube 7o, of

5o vulcanite or like insulating material, put in its place. This tube is made to closely einbrace the insulating material c.

Z is a tube ot vnlcanite Iitting loosely over the tubes 7c, and m m are outer tubes of vulcanitc, thickened at one end, and made to lit upon the tubes 7.:, where these also are slightly thickened. India-rubber varnish may be lled into the space between the tubes k and m.

To make one of the joints, the outer tubir lar conductor bis iirst cut away for a distance 6o 'from the end of each of the lengths which are to be joined. The metal ringsy c" are slipped onto the outer conductors, and the vulcanite tubes 7c are fixed in place. The vulcanite tubes m are slipped onto the outer metallic tubes b of the two lengths, and also the vulcanite tube Zonto one of the lengths. The corrugated tube 7L is also slipped over the end of one of the lengths. The cones of copper f are now screwed into the ends of the inner 7o conductors, which have previously been prepared to receive them. These cones have iianges extending around their outer ends, andy in these are holes for the ends of the copper strands g to be passed into. IVhen the ends of the strands have been inserted into the holes, they are xed therein by solder. The vulcanite tubes m and l are now slipped into their proper places, the joints between the Vulcanite tubes m and k being made tight by 8o india-rubber cement. rlhe rings t t" and the corrugated tube 7L are now slipped into their proper places. When this has been done, white-metal or solder is poured into the spaces between the rings i o" through holes 0, formed 8 5 :tor the purpose through the tube 7L. The parts with which the molten metal comes into contact having been all previously tinned, these parts become securely soldered together, and the joint is complete. 9o

l. The combination of the inner conductors a, coupled by cones or plugs f, and. flexible conducting-strands g, the outer concentric conductors b, Coupled by an extensible tube h, 9 5 and the insulating-screens 7.',v Z fm, interposed between the extensible tube and the concsf and strands g.

2. The combination, with two electric conductors end to end and connected by a .tleXi- Ico ble connection, ns g, of the surrounding telescoping insulators.

3. rl`he combination, with two electric conductors connected end to end, of the Surrounding teleseoping iinsulnvtore` und the oorrugatecl metal. tube surrounding' the insulators, suhstznitially :is Set forth.

.4c A ilexihle or expansion joint .loreleetrie conductors formed oili' i inetultuhe corrugated transversely :nul secured at one end to the cnil of one length of conductor and :it the other end to the next length.

5. A joint connecting the endof two lengths of un electrical conductor composed of two ringsfi 1i', surrounding euch length neuiits end :it n distance apart from 'one another, u

metullie tube, ne 7L, surroumling the rings on hoth lengths7 mul fusible metall filling,r the Spaces on euch length between the two rings mul between the conductor entlmetullie tubo. (5. The combination el two rigid interior tubular conductors or 1'e(ls,ile\ible copper Strands connecting them end te enll, other tubulinconductors Surrouiuling the interior conductors, und insulating mnterinl sepi'irntlng the interior ctnuluetors und their Coupl ingconnection from the exterior conductors.

SEBASTIAN Zl'ANl lll-l lilllillAN'lI. 

